Log into your Absolutely Fresh account via this page. While ordering, you have also done this; it goes in the same way.
Under Settings, you can change the e-mail address associated with your account. Any new orders will then be linked to the correct e-mail address.

Have you already placed an order and an incorrect e-mail address is linked to it? Unfortunately, we cannot change this for you, but Paylogic can. This page explains exactly which steps you need to take.